User Account

All Pages

Assumptions of a paired t-test

Assignment Help Basic Statistics
Reference no: EM13860393

1. Consider a dataset of two paired variables, X and Y, that have the following properties

n=8    x>y      Sy>0       SEd=0

a. Provide values for x and y that have the four properties listed above. there are many possible solutions, so be sure to show that each of these properties is true.

b. Suppose this data met all assumptions of a paired t-test. Why would you still be unable to test if there is a significant mean difference?

2. To investigate if autism is marked by different brain growth parents in early life, studies have tried to link brain size in infants and toddlers to autism. Suppose the whole-brain volume in non-autisitic toddlers is known to be 1200 milliliters, on average. One study based on a sample size of 35 estimated the mean whole-brain volume in autistic toddlers with a 95% confidence interval of [1220ml, 1400ml].

a. Do the results from this study suggest that autistic toddlers have the same whole-brain volume on average?

b. If you used the same data from this study and calculated a 90% confidence interval, would it be wider or narrower than the 95% interval?

c. If the data from this study had the same mean and SD, but was from a sample size of 70 instead of 35, would the 95% confidence have been wider or narrower?

Reference no: EM13860393

Questions Cloud

Determine who should be held liable for any breaches : Determine who should be held liable for any breaches that occur, and indicate the course(s) of action that should be taken.
Calculate the correlation coefficient : Using excel, calculate the correlation coefficient, r,  for the two variables.  How would you interpret this measure?
Describe top-three fears in competing in global market : Describe your top-three fears in competing in the global market, and how you plan to overcome those fears. Provide support for your rationale.
What will be the price at which the bond is issued : What is the funded status of this plan? What will be the price at which the bond is issued? What periodic interest payment does Kirner make?
Assumptions of a paired t-test : Suppose this data met all assumptions of a paired t-test. Why would you still be unable to test if there is a significant mean difference?
Please describe the difference between classes and objects : Please describe the difference between classes and objects. How are they related? What does it mean to instantiate an object? Also, please describe the difference between composition and aggregation and when it is better to use one over the other?
Identify different professionally-oriented roles an engineer : different professionally-oriented roles an engineer
Methods for decreasing the waiting time : An amusement park studied methods for decreasing the waiting time (minutes) for rides by loading and uploading riders more efficiently. Two alternative loading/unloading methods have been proposed.
What proportion of the obligation is funded : How much total benefits did former employees receive during the year? What proportion of the obligation is funded? Explain.

Reviews

Write a Review

Basic Statistics Questions & Answers

  A sample proportion is calculated from a sample size of 201

a sample proportion is calculated from a sample size of 201. how large of a sample would we need to decrease the

  The number of taxicabs waiting outside a popular downtown

the number of taxicabs waiting outside a popular downtown bar can be modeled as a poisson random variable. the

  Find null hypothesis if repair cost has a normal curve

The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve. What is the null hypothesis?

  Display the data in a stem-and-leaf plot

The heights in inches of 18 randomly selected adult males in LA are listed as: 70, 69, 72, 57, 70, 66, 69, 73, 80, 68, 71, 68, 72, 67, 58, 74, 81, 72. Display the data in a stem-and-leaf plot.

  A skeptical paranormal researcher claims that the

a skeptical paranormal researcher claims that the porportion of americans that have seen a ufo p is less than 4 in

  Performance of most recent class is significantly better

Class of 22 obtains a mean of 92 and a standard deviation of 4. Is he correct in assuming that the performance of the most recent class is significantly better than that of other classes?

  Random sample of gre verbal exams

Suppose you study a random sample of 100 GRE verbal exams. Determine the probability that the average (mean) score in this sample will be between 485 and 515.

  Find logic behind using sum of products of deviation scores

What is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient? Is this logic sound?

  Denote the population proportion who believe in an

gender and belief in afterlife. the table shows results from the 2008 general social survey on gender and whether or

  Elementary statistics problem

An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.

  Binomial probability-seat belts

Suppose 72% of the drivers regularly use seat belts. You take a random sample of 10 of these drivers. What is the probability that the number regularly using seat belts is at least 7?

  Create a sample frequency distribution

Create a sample frequency distribution for one of the variables. Choose either a simple or grouped frequency distribution and explain your choice.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd